Romanuel
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buys a book and with an army of 147 goblins, 8 orcs, 11 centaurs, and 7 gargoyles, kills the remaining Warlock.
53 goblins survive.
Victory.
Final result: 7 days, 5-1-1-1, 3 mercury.
Added 13 minutes later
By the way, huge respect to Fireball for the speed – it's amazing to complete such a run in 13 hours – that's really impressive.